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linux/net/mac80211/debugfs_key.c
Johannes Berg db388a567f mac80211: move TX PN to public part of key struct 
For drivers supporting TSO or similar features, but that still have
PN assignment in software, there's a need to have some memory to
store the current PN value. As mac80211 already stores this and it's
somewhat complicated to add a per-driver area to the key struct (due
to the dynamic sizing thereof) it makes sense to just move the TX PN
to the keyconf, i.e. the public part of the key struct.

As TKIP is more complicated and we won't able to offload it in this
way right now (fast-xmit is skipped for TKIP unless the HW does it
all, and our hardware needs MMIC calculation in software) I've not
moved that for now - it's possible but requires exposing a lot of
the internal TKIP state.

As an bonus side effect, we can remove a lot of code by assuming the
keyseq struct has a certain layout - with BUILD_BUG_ON to verify it.

This might also improve performance, since now TX and RX no longer
share a cacheline.

Reviewed-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2015-06-02 11:16:35 +02:00

402 lines
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/*
* Copyright 2003-2005 Devicescape Software, Inc.
* Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
* Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/kobject.h>
#include <linux/slab.h>
#include "ieee80211_i.h"
#include "key.h"
#include "debugfs.h"
#include "debugfs_key.h"
#define KEY_READ(name, prop, format_string) \
static ssize_t key_##name##_read(struct file *file, \
char __user *userbuf, \
size_t count, loff_t *ppos) \
{ \
struct ieee80211_key *key = file->private_data; \
return mac80211_format_buffer(userbuf, count, ppos, \
format_string, key->prop); \
}
#define KEY_READ_D(name) KEY_READ(name, name, "%d\n")
#define KEY_READ_X(name) KEY_READ(name, name, "0x%x\n")
#define KEY_OPS(name) \
static const struct file_operations key_ ##name## _ops = { \
.read = key_##name##_read, \
.open = simple_open, \
.llseek = generic_file_llseek, \
}
#define KEY_FILE(name, format) \
KEY_READ_##format(name) \
KEY_OPS(name)
#define KEY_CONF_READ(name, format_string) \
KEY_READ(conf_##name, conf.name, format_string)
#define KEY_CONF_READ_D(name) KEY_CONF_READ(name, "%d\n")
#define KEY_CONF_OPS(name) \
static const struct file_operations key_ ##name## _ops = { \
.read = key_conf_##name##_read, \
.open = simple_open, \
.llseek = generic_file_llseek, \
}
#define KEY_CONF_FILE(name, format) \
KEY_CONF_READ_##format(name) \
KEY_CONF_OPS(name)
KEY_CONF_FILE(keylen, D);
KEY_CONF_FILE(keyidx, D);
KEY_CONF_FILE(hw_key_idx, D);
KEY_FILE(flags, X);
KEY_FILE(tx_rx_count, D);
KEY_READ(ifindex, sdata->name, "%s\n");
KEY_OPS(ifindex);
static ssize_t key_algorithm_read(struct file *file,
char __user *userbuf,
size_t count, loff_t *ppos)
{
char buf[15];
struct ieee80211_key *key = file->private_data;
u32 c = key->conf.cipher;
sprintf(buf, "%.2x-%.2x-%.2x:%d\n",
c >> 24, (c >> 16) & 0xff, (c >> 8) & 0xff, c & 0xff);
return simple_read_from_buffer(userbuf, count, ppos, buf, strlen(buf));
}
KEY_OPS(algorithm);
static ssize_t key_tx_spec_read(struct file *file, char __user *userbuf,
size_t count, loff_t *ppos)
{
u64 pn;
char buf[20];
int len;
struct ieee80211_key *key = file->private_data;
switch (key->conf.cipher) {
case WLAN_CIPHER_SUITE_WEP40:
case WLAN_CIPHER_SUITE_WEP104:
len = scnprintf(buf, sizeof(buf), "\n");
break;
case WLAN_CIPHER_SUITE_TKIP:
len = scnprintf(buf, sizeof(buf), "%08x %04x\n",
key->u.tkip.tx.iv32,
key->u.tkip.tx.iv16);
break;
case WLAN_CIPHER_SUITE_CCMP:
case WLAN_CIPHER_SUITE_CCMP_256:
case WLAN_CIPHER_SUITE_AES_CMAC:
case WLAN_CIPHER_SUITE_BIP_CMAC_256:
case WLAN_CIPHER_SUITE_BIP_GMAC_128:
case WLAN_CIPHER_SUITE_BIP_GMAC_256:
case WLAN_CIPHER_SUITE_GCMP:
case WLAN_CIPHER_SUITE_GCMP_256:
pn = atomic64_read(&key->conf.tx_pn);
len = scnprintf(buf, sizeof(buf), "%02x%02x%02x%02x%02x%02x\n",
(u8)(pn >> 40), (u8)(pn >> 32), (u8)(pn >> 24),
(u8)(pn >> 16), (u8)(pn >> 8), (u8)pn);
break;
default:
return 0;
}
return simple_read_from_buffer(userbuf, count, ppos, buf, len);
}
KEY_OPS(tx_spec);
static ssize_t key_rx_spec_read(struct file *file, char __user *userbuf,
size_t count, loff_t *ppos)
{
struct ieee80211_key *key = file->private_data;
char buf[14*IEEE80211_NUM_TIDS+1], *p = buf;
int i, len;
const u8 *rpn;
switch (key->conf.cipher) {
case WLAN_CIPHER_SUITE_WEP40:
case WLAN_CIPHER_SUITE_WEP104:
len = scnprintf(buf, sizeof(buf), "\n");
break;
case WLAN_CIPHER_SUITE_TKIP:
for (i = 0; i < IEEE80211_NUM_TIDS; i++)
p += scnprintf(p, sizeof(buf)+buf-p,
"%08x %04x\n",
key->u.tkip.rx[i].iv32,
key->u.tkip.rx[i].iv16);
len = p - buf;
break;
case WLAN_CIPHER_SUITE_CCMP:
case WLAN_CIPHER_SUITE_CCMP_256:
for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) {
rpn = key->u.ccmp.rx_pn[i];
p += scnprintf(p, sizeof(buf)+buf-p,
"%02x%02x%02x%02x%02x%02x\n",
rpn[0], rpn[1], rpn[2],
rpn[3], rpn[4], rpn[5]);
}
len = p - buf;
break;
case WLAN_CIPHER_SUITE_AES_CMAC:
case WLAN_CIPHER_SUITE_BIP_CMAC_256:
rpn = key->u.aes_cmac.rx_pn;
p += scnprintf(p, sizeof(buf)+buf-p,
"%02x%02x%02x%02x%02x%02x\n",
rpn[0], rpn[1], rpn[2],
rpn[3], rpn[4], rpn[5]);
len = p - buf;
break;
case WLAN_CIPHER_SUITE_BIP_GMAC_128:
case WLAN_CIPHER_SUITE_BIP_GMAC_256:
rpn = key->u.aes_gmac.rx_pn;
p += scnprintf(p, sizeof(buf)+buf-p,
"%02x%02x%02x%02x%02x%02x\n",
rpn[0], rpn[1], rpn[2],
rpn[3], rpn[4], rpn[5]);
len = p - buf;
break;
case WLAN_CIPHER_SUITE_GCMP:
case WLAN_CIPHER_SUITE_GCMP_256:
for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) {
rpn = key->u.gcmp.rx_pn[i];
p += scnprintf(p, sizeof(buf)+buf-p,
"%02x%02x%02x%02x%02x%02x\n",
rpn[0], rpn[1], rpn[2],
rpn[3], rpn[4], rpn[5]);
}
len = p - buf;
break;
default:
return 0;
}
return simple_read_from_buffer(userbuf, count, ppos, buf, len);
}
KEY_OPS(rx_spec);
static ssize_t key_replays_read(struct file *file, char __user *userbuf,
size_t count, loff_t *ppos)
{
struct ieee80211_key *key = file->private_data;
char buf[20];
int len;
switch (key->conf.cipher) {
case WLAN_CIPHER_SUITE_CCMP:
case WLAN_CIPHER_SUITE_CCMP_256:
len = scnprintf(buf, sizeof(buf), "%u\n", key->u.ccmp.replays);
break;
case WLAN_CIPHER_SUITE_AES_CMAC:
case WLAN_CIPHER_SUITE_BIP_CMAC_256:
len = scnprintf(buf, sizeof(buf), "%u\n",
key->u.aes_cmac.replays);
break;
case WLAN_CIPHER_SUITE_BIP_GMAC_128:
case WLAN_CIPHER_SUITE_BIP_GMAC_256:
len = scnprintf(buf, sizeof(buf), "%u\n",
key->u.aes_gmac.replays);
break;
case WLAN_CIPHER_SUITE_GCMP:
case WLAN_CIPHER_SUITE_GCMP_256:
len = scnprintf(buf, sizeof(buf), "%u\n", key->u.gcmp.replays);
break;
default:
return 0;
}
return simple_read_from_buffer(userbuf, count, ppos, buf, len);
}
KEY_OPS(replays);
static ssize_t key_icverrors_read(struct file *file, char __user *userbuf,
size_t count, loff_t *ppos)
{
struct ieee80211_key *key = file->private_data;
char buf[20];
int len;
switch (key->conf.cipher) {
case WLAN_CIPHER_SUITE_AES_CMAC:
case WLAN_CIPHER_SUITE_BIP_CMAC_256:
len = scnprintf(buf, sizeof(buf), "%u\n",
key->u.aes_cmac.icverrors);
break;
case WLAN_CIPHER_SUITE_BIP_GMAC_128:
case WLAN_CIPHER_SUITE_BIP_GMAC_256:
len = scnprintf(buf, sizeof(buf), "%u\n",
key->u.aes_gmac.icverrors);
break;
default:
return 0;
}
return simple_read_from_buffer(userbuf, count, ppos, buf, len);
}
KEY_OPS(icverrors);
static ssize_t key_mic_failures_read(struct file *file, char __user *userbuf,
size_t count, loff_t *ppos)
{
struct ieee80211_key *key = file->private_data;
char buf[20];
int len;
if (key->conf.cipher != WLAN_CIPHER_SUITE_TKIP)
return -EINVAL;
len = scnprintf(buf, sizeof(buf), "%u\n", key->u.tkip.mic_failures);
return simple_read_from_buffer(userbuf, count, ppos, buf, len);
}
KEY_OPS(mic_failures);
static ssize_t key_key_read(struct file *file, char __user *userbuf,
size_t count, loff_t *ppos)
{
struct ieee80211_key *key = file->private_data;
int i, bufsize = 2 * key->conf.keylen + 2;
char *buf = kmalloc(bufsize, GFP_KERNEL);
char *p = buf;
ssize_t res;
if (!buf)
return -ENOMEM;
for (i = 0; i < key->conf.keylen; i++)
p += scnprintf(p, bufsize + buf - p, "%02x", key->conf.key[i]);
p += scnprintf(p, bufsize+buf-p, "\n");
res = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
kfree(buf);
return res;
}
KEY_OPS(key);
#define DEBUGFS_ADD(name) \
debugfs_create_file(#name, 0400, key->debugfs.dir, \
key, &key_##name##_ops);
void ieee80211_debugfs_key_add(struct ieee80211_key *key)
{
static int keycount;
char buf[100];
struct sta_info *sta;
if (!key->local->debugfs.keys)
return;
sprintf(buf, "%d", keycount);
key->debugfs.cnt = keycount;
keycount++;
key->debugfs.dir = debugfs_create_dir(buf,
key->local->debugfs.keys);
if (!key->debugfs.dir)
return;
sta = key->sta;
if (sta) {
sprintf(buf, "../../netdev:%s/stations/%pM",
sta->sdata->name, sta->sta.addr);
key->debugfs.stalink =
debugfs_create_symlink("station", key->debugfs.dir, buf);
}
DEBUGFS_ADD(keylen);
DEBUGFS_ADD(flags);
DEBUGFS_ADD(keyidx);
DEBUGFS_ADD(hw_key_idx);
DEBUGFS_ADD(tx_rx_count);
DEBUGFS_ADD(algorithm);
DEBUGFS_ADD(tx_spec);
DEBUGFS_ADD(rx_spec);
DEBUGFS_ADD(replays);
DEBUGFS_ADD(icverrors);
DEBUGFS_ADD(mic_failures);
DEBUGFS_ADD(key);
DEBUGFS_ADD(ifindex);
};
void ieee80211_debugfs_key_remove(struct ieee80211_key *key)
{
if (!key)
return;
debugfs_remove_recursive(key->debugfs.dir);
key->debugfs.dir = NULL;
}
void ieee80211_debugfs_key_update_default(struct ieee80211_sub_if_data *sdata)
{
char buf[50];
struct ieee80211_key *key;
if (!sdata->vif.debugfs_dir)
return;
lockdep_assert_held(&sdata->local->key_mtx);
debugfs_remove(sdata->debugfs.default_unicast_key);
sdata->debugfs.default_unicast_key = NULL;
if (sdata->default_unicast_key) {
key = key_mtx_dereference(sdata->local,
sdata->default_unicast_key);
sprintf(buf, "../keys/%d", key->debugfs.cnt);
sdata->debugfs.default_unicast_key =
debugfs_create_symlink("default_unicast_key",
sdata->vif.debugfs_dir, buf);
}
debugfs_remove(sdata->debugfs.default_multicast_key);
sdata->debugfs.default_multicast_key = NULL;
if (sdata->default_multicast_key) {
key = key_mtx_dereference(sdata->local,
sdata->default_multicast_key);
sprintf(buf, "../keys/%d", key->debugfs.cnt);
sdata->debugfs.default_multicast_key =
debugfs_create_symlink("default_multicast_key",
sdata->vif.debugfs_dir, buf);
}
}
void ieee80211_debugfs_key_add_mgmt_default(struct ieee80211_sub_if_data *sdata)
{
char buf[50];
struct ieee80211_key *key;
if (!sdata->vif.debugfs_dir)
return;
key = key_mtx_dereference(sdata->local,
sdata->default_mgmt_key);
if (key) {
sprintf(buf, "../keys/%d", key->debugfs.cnt);
sdata->debugfs.default_mgmt_key =
debugfs_create_symlink("default_mgmt_key",
sdata->vif.debugfs_dir, buf);
} else
ieee80211_debugfs_key_remove_mgmt_default(sdata);
}
void ieee80211_debugfs_key_remove_mgmt_default(struct ieee80211_sub_if_data *sdata)
{
if (!sdata)
return;
debugfs_remove(sdata->debugfs.default_mgmt_key);
sdata->debugfs.default_mgmt_key = NULL;
}
void ieee80211_debugfs_key_sta_del(struct ieee80211_key *key,
struct sta_info *sta)
{
debugfs_remove(key->debugfs.stalink);
key->debugfs.stalink = NULL;
}
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